olfactory organ vs neb

olfactory organ and neb both are nouns.

Word	Noun	Adjective	Verb	Adverb
olfactory organ	Yes	No	No	No
neb	Yes	No	No	No

As nouns, neb is a hyponym of olfactory organ; that is, neb is a word with a more specific, narrower meaning than olfactory organ:

olfactory organ: the organ of smell and entrance to the respiratory tract; the prominent part of the face of man or other mammals
neb: a long projecting or anterior elongation of an animal's head; especially the nose

olfactory organ (noun)	neb (noun)
the organ of smell and entrance to the respiratory tract; the prominent part of the face of man or other mammals	horny projecting mouth of a bird
	a long projecting or anterior elongation of an animal's head; especially the nose